CONTENTS. xiii 



CHAPTER VI. 



The Blood in the Invertehrata : The Size of some Invertebrate Cor- 

 puscles — Coagulation of Invertebrate Blood — The Protozoa and 

 Porifera devoid of Blood— The Blood in the Actinozoa and 

 EchiTwdermata — The Blood in the Myriapoda : Three distinct 

 Corpuscles — The Blood in the Annelida : The Fluids of the 

 Perivisceral Cavity and the Pseudo-haemal System ; First appear- 

 ance of a Coloured Corpuscle ; Researches of MacMunn, Lankester, 

 Delle Chiaje, Schwalbe, Krukenberg, and Milne-Edwards— The 

 Blood in the Inaecta : Pigments of the Blood ; Researches of 

 Poulton and Fredericq ; Coagulation of Insects' Blood — The Blood 

 in the Orugtacea: Investigations of Fredericq; Percentages of 

 Saline Matter in Crustacean Blood ; Densities of Crustacean 

 Blood ; Blood of the MoUusca : Researches of Griffiths, Cuenot, 

 Fredericq, and Krukenberg ; Transport of Oxygen by means 

 of Hsemocyanin ; Percentages of Saline Matter in MoUuscan 

 Blood ; Saline Composition of MoUuscan Blood — The Chro- 

 matology of Invertebrate Blood : Researches of MaoMunn, 

 Poulton, and others ; The Haemoglobin of Lumhricug ; Mioro- 

 speotroscopes — Griffiths' Researches on the Gases of the Inverte- 

 brate Blood — General Remarks, &c. .... 125 



CHAPTER VII. 



Circulation in the Invertehrata : Fusion of Circulation and Digestion 

 in the Protozoa, Porifera, and Ccelenterata — Blood and Vascular 

 Systems in the EcTiinodermata and Annelida — Circulation in the 

 Trichoscolices, Arthropoda, Polyzoa, Bradiiqpoda, MoUusca, and 

 Tunicata, &c 182 



CHAPTER VIII. 



Respiration in the Invertehrata : Respiration in the Protozoa, Porifera, 

 Codenterata : Respiratory Pigments ; Researches of Moseley, 

 MacMunn, M'Kendrick, Krukenberg, and De Negri ; Internal or 

 Tissue Respiration ; Respiration in the Bchinodermata ; Investi- 

 gations of Dugfes, MacMunn, and Foettinger — Respiration in the 

 Trichoscolices and Annelida : Researches of MacMunn, Geddes, 

 Beddard, and Vejdovsky — Respiration in the Ifematoscolices : 



